Provide better configuration management / better documentation for configuration management

[macdja38]

In the iOS app build flow and android flow you can configure different variables to be used in Production / Staging / Dev builds.

As it stands at least the documented capacitor workflow for capacitor.config.json doesn't allow for using a different values for production vs staging, say you wanted to load from a different server the server.url would have to be edited by the user then copies to the environments.

There are also no best practice / documented recommendations on how to manage the capacitor.config.json file with source control / with staging / ci environments as far as I can find?

[imhoffd]

Closed in favor of #3141

[ionitron-bot]

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